Telegraph system



C. HALTER.

TELEGRAPH SYSTEM.

APPl .lCAT|0N mw 050.22. 1911.

Patented Nov. 15, 1921.

UNITED STATES PAJENT OFFICE.

CARL HALTER, OF CHICAGO, ILLINOIS, ASSIGNOR TO WESTERN ELECTRIC COMPANY,

INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEGRAPH SYSTEM.

Specification of Letters latent.

Patented Nov. 15, 1921.

Application filed December 22, 1917. Serial No. 208,472.

To all whom ii may concern: a h 1 Be it known that I, CARL HALTE a citizen of the United States, residing at Chicago, in the county of'Cook, State of Illinois", have invented certain new and useful Improvements in Telegraph Systems, of which the following is a full, clear, concise,

. and exact description.

This invention relates to printing tele;

graph systems, andparticularly to mecha nisms used therein known as correcting de- 11 vices, whereby a rotating mechanism at one end of a telegraph line is kept substantially in synchronism with one at the other end of the-line.

The object of the invention isto provide 1 a mechanism, as set forth. above, which is inexpensive to manufacture, simple and compact in its structure, and hlghly efficient in its operatlon.

The invention comprises a power-driven shaft, and a distributer shaft adapted to be driven thereby. The driving connection between the two shafts comprlses a member on the end of one of the shafts and means on the endof the other shaft for engaging said 1 membeni This engaging means is operated at suitable intervals, tobe releasedfrom the member momentarily,-by means of a magnet which receives correcting impulses, the armature of which magnet is. attached to the engaging means. During the small intervals of time that the member is released,

the friction of the moving parts therewith connected causes it to lag slightly behind thexdriving shaft by an amount which is w ofthe mechanism, partly in section; Fig. 2 is a section taken on line 2, 2 of Fig. 1, showing the magnet armature in one position; Fig. 3 is a section taken on line2, 2 of Fig. 1, showing the magnet armature in 1 another position; Fig. 4 1s a diagrammatic circuit arrangement for the mechanism.

As illustratedin the drawings the invention comprises a power-driven shaft 1, in

alinement with which isa driven shaft 2,

. which carries an arm 3 having thereon brushes 4 bearing against the segments 5 of the distributer with a predetermined pressure. The shafts 1 and 2 are suitably journaled in standards 6, 7 and 8. Fixed in standard 6 and surrounding shaft 1 throughout-part ofits length, is a tubular magnet 9 having a core 10 extending beyond the end of magnet 9 and along the shaft 1. To the end adjacent shaft 2 of shaft 1 is fixed a disk 11, having screws 12 in its front face, the heads of which project into slots 13 in a .plate 14: which is mounted diametrically with respect to the front face of plate 11 and adapted to slide thereon. Projecting rearwardly from plate lithrough an opening 15 in the disk 11, is an armature 16 which is attracted upon the energization of magnet 9 and imparts a slidingmovement to plate 14 across the face disk 11. A spring 17 fastened at one end of disk 11 and at the other to armature 16 withdraws armature 16 and plate 14 when magnet 9 is deenergized. At each end ofplate 14 is a pawl 18, one of which (see Fig. 2) is adapted to normally engage the teeth of ratchet wheel 19 mounted on the adjacentend of shaft 2. The other of said pawls 18 is adapted to engagethe teeth of ratchet wheel 19 when the magnet 9 is energized, and through its armature 16, movesthe plate let and its pawls 18 out of normal position (see Fig. 3). When magnet 9 becomes deenergized spring 17 moves plate 14: back to normal again, thereby disengaging one pawl 18 from and engaging theother pawl 18 with the ratchet wheel 19. The pawls and the teeth 'of the ratchet wheel 19 are so designed that for a very short instant of time neither. 'of them' is fully engaged with the teeth. At this time the friction of the brushes 4: on the segments 5, previously approximated, causes the shaft 2 for a very short instant to be retarded slightly so that ratchet whe'el19 moves backward (in the direction shown by the arrow in Fig. 2) the space of one-half a tooth with respect to the pawls 18 and the shaft 1. This stepping back occurs at each movement of the plate 14, so that in one complete recipro:

cation of plate 14 the wheel is moved back a full distance of. one tooth. The teethof the Wheel 19.. and the pressure with which the brushes 4 bear against segments 5 may be so arranged as to make such dlstance of any desired value.

I mally closed spring contact members 24 and 25, and open the same on its downward movement. Spring members 24- and 25 are fastened at one end to the upper lnsulated portion 26 of standard 6. A spring 27 attached at one end to the bracket and at Patent No.

position.

'mal pawl, but before so doing the other end to pin 28 on armature 21 tends normally to hold armature 21 in its retracted The circuit connections for the mechanism are illustrated in Fig. 4, in which 30 is a correcting relay of the type preferably shown in the application of P. M. Rainey, Serial No. 827,315, filed March26, 1914, issued as 1,279,905, Sept. 24., 1918, the armature 31 of which controls a local circuit to a distribi'iter-correcting ring 32 and correcting segments 33. A relay is momentarily energized by the impulse so received and pulls up its armature 35, putting battery 36 on tubular magnet 9 through armature contacts 24 and 25. and at the same time lockingrelay 34. When magnet 9 energizes, it pulls up its armature, breaking its own circuit and that of relay 9 at contacts 24 and 25. A key 37 is provided so that manual correction maybehad. By depressing key 37 battery 38 is put on magnet 9 to correct as abovedescribed.

In the operation of the device a. distributer arm is normally driven through shafts 1 and 2 byany suitable source of power, the normal connections between shafts 1 and 2 being undisturbed.

When a correcting impulse is received through segment 33, the relay 34 is energized, pullingup its armature 35, locking itself, and energizing magnet 9. Magnet 9 thereupon opens contacts 24 and 25 asabove described, and at the same time pulls up armature 16 and plate 14, thereby disengaging the pawl 18 normally engaged with ratchet wheel 19, and momentarily permitting a slight angular displacement of the teeth withrespect to'thc pawls 18, a distance amounting to the space of one-half a tooth, due to the retarding effect of the pressure between brushes 4 and segment 5. lVhen magnet 9 is deenergized the spring 17 pulls plate 14 back, caus'ingthe engagement of the norpermitting another displacement of the ratchet wheel a distance of one-half a tooth. By properly designing the teeth of'the ratchet wheel and the pressure of the brushes on the segments, the amount of movement of the ratchet wheel thus effected may be varied as desired. It will be readily understood that the driving effect of the pawls themselves on the ratchet wheel will aid the friction in stepping back the distributer shaft (see Figs. 2 and 3). By thus causing the friction to retard the driving shaft the magnets used need not be so heavy and powerful, thereby eliminating the necessity of heavy, cumbersome apparatus.

What is claimed is:

1. In a telegraph system, a correcting mechanism comprising a driving shaft, a driven shaft adjacent to and in alinement therewith, a commutator, a brush carried by the driven shaft and adapted to bear against said commutator with a predetermined pressure, a ratchet wheel on the end of the driven shaft, a disk on the adjacent end of the driving shaft, a reciprocating plate slidably and diametrically mounted on said disk, a pawl at each end of said plate, one of said pawls being adapted to normally engage said ratchet wheel, an armature carried by said plate, a. tubular magnet surrounding said driving shaft and adapted to attract said armature to momentarily disconnect the pawls from the ratchet wheel and permit an angular retafdation of the driven shaft with respect to the driving shaft, means for energizing said magnet, means for deenergizing said magnet, and means for retracting said plate when said magnet is deenergized.

2. In combination, a driving shaft, a driven shaft, means for coupling said shafts comprising a ratchet wheel carried by one of said shafts and an escapement pawl carried by and rotating with the other said shaft and engaging said ratchet wheel and an electromagnet concentrically mounted with respect to one of said shafts for oscillating said pawl to permit a step-by-step slippage of one shaft with respect to the other shaft.

3. In combination, a driving shaft, a driven shaft, a ratchet wheel secured at one end of the driven shaft, a disk mounted at one end of the driving shaft adjacent to said ratchet wheel, a member slidably and diametrically mounted on said disk, and electromagnetic means operative for controlling the movement of said member to permit an angular displacement of one shaft with respect to the other.

4. In combination, a driving shaft, a driven shaft, a ratchet wheel secured to one end of said driven shaft, a slidable plate mounted on one end of said driving shaft adjacent to said ratchet wheel, a pair of diametrically opposite members positioned on said plate and arranged to engage said ratchet wheel, and means for causing the engagement and disengagement of said members to ermit an angular displacement of electromagnetic means operative for shiftone sha with respect to the other. ing the position of said member and pawls 10 5. In combination, a drivin shaft, a to permlt an angular displacement of one driven shaft, a ratchet wheel fixe on one end shaft with respect to the other.

5 of said driven shaft, 2) member diametricall In witness whereof, hereunto subscribe mounted on one end of said driving shaft ad my name this 11th day of Dec, A. D. 1917.

jacent to said ratchet Wheel, an escapement pawl secured to each end of said member, and CARL HALTER. 

